at Google ScholarTitle data
Schönauer-Kamin, Daniela ; Fleischer, Maximilian ; Moos, Ralf:
Half-cell characterization of a novel NH3 gas sensor.
In:
14th International Meeting on Chemical Sensors : IMCS 2012. -
Wunstorf
: AMA Verband für Sensorik und Messtechnik e.V.
,
2012
ISBN 978-3-9813484-2-2
DOI: https://doi.org/10.5162/IMCS2012/P2.6.5
Abstract in another language
The function of a novel electrochemical NH3 gas sensor for application in SCR-systems is investigated. It provides a semi-logarithmic characteristic curve with a high NH3-sensitivity and marginal NOx cross interference at 550 °C. The electrochemical cell of the sensor device can be defined as Au | YSZ | Au, VWT. It is assumed that the sensing mechanism is based on nonequilibrium conditions (mixed potential theory) including electrochemical kinetics. This paper describes the investigation of electrode potentials and polarization curves of the half-cells Au | YSZ and Au, VWT | YSZ in dependence of NH3, which provides essential information about electrochemical reactions at the three-phase boundary. All electrode potentials depend on reactive gas concentration, whereby the electrode potential of the VWT-covered Au-electrode shows a stronger dependency on the NH3 concentration. The formation of mixed potentials at both electrodes is confirmed. Additionally, the influence of the VWT-catalyst coating on the sensing mechanism and the sensitivity is demonstrated. The sensitivity increases with increasing coverage of the Au-electrode with VWT catalyst. Voltage-current curves help to analyze the kinetics of electrochemical reactions at the TPB. A clear shift in cathodic direction (to more negative potentials) can be observed with increasing NH3 concentration and the current increases at a fixed potential due to an enhanced electrochemical NH3 oxidation.
Further data
| Item Type: | Article in a book |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos Faculties Faculties > Faculty of Engineering Science > Chair Functional Materials Profile Fields > Advanced Fields > Advanced Materials Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT Profile Fields Profile Fields > Advanced Fields Research Institutions Research Institutions > Research Centres |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 600 Technology, medicine, applied sciences > 620 Engineering |
| Date Deposited: | 20 Apr 2015 10:28 |
| Last Modified: | 23 Jan 2023 14:32 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/10483 |